*{
    padding: 0;
    margin: 0;
}
.target {
    display: inline-block;
    background-color: #9ee7ea;
    width: 60px;
    height: 40px;
}
.target:hover{
    background-color: darkorange;
}
#box{
    width: 20000px;
    height: 20000px;
    background-color: #d6d6d6;
}
#start {}
